P0115

Engine Coolant Temperature Circuit Malfunction

Severity: Medium Fuel & Air Metering Generic OBD-II Code Est. Repair: $40 - $150

Schedule diagnosis soon. Continued driving may worsen the issue.

Quick Answer

P0115 means “Engine Coolant Temperature Circuit Malfunction.” Severity: Medium. Estimated repair cost: $40 - $150. Most common sign: CEL.

What Does P0115 Mean?

ECT sensor signal is implausible or out of range.

Common Symptoms

CEL
Poor fuel economy
Cooling fan running constantly
Hard cold starts

Possible Causes

Faulty ECT sensor
Corroded connector
Wiring short/open

How to Fix P0115 – Repair Guide

Inspect connector for corrosion
Test sensor resistance at known temps
Replace sensor
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Budgeting for This Repair?

A typical P0115 repair runs about $40 - $150. If you'd rather spread the cost over time, estimate the payment with our free sister tool: Car Finance Calculator (50-state sales tax, trade-in equity, full amortization).

Recommended OBD2 Scanners & Tools

To read and clear this code yourself, you need a reliable OBD2 scanner. Here are top-rated options:

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FIXD Bluetooth OBD2 Scanner

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.